Jay Z's Stylish Summer Shirt, Courtesy of Theory

OK, we don't endorseyou wearing a gigantic gold chain — that move is strictly for Hova — but we're really liking the crisp white shirt he's wearing in this photo from his performance at the Yahoo! Wireless Festival (he also wore it for the filming of the "Picasso Baby" music video). Short-sleeved (crucial, especially with this heat wave) and detailed with double chest pockets, it's a great warm-weather style, living in that sweet spot between dressed-up and dressed-down that you yourself should be occupying until Labor Day rolls around. Want one? You're in luck. We just found out it's made by the good folks at Theory, and you can buy it right here. Wear it well. And remember: no gold chains.